SQL Server 2012:加权平均计算

问题描述

我正在尝试计算表格中某些数据的加权平均成熟度.

I'm trying to calculate the weighted average maturity of some data in my table.

SaleEventID  LID(PK)    CurrentUPB         Interest Rate    RemainingMonths
1            1          $100,000.00         6.100%           11.00
1            2          $67,000.00          6.200%           360.00
1            3          $1,400,000.00       6.300%           240.00
1            4          $500,000.00         7.000%           100.00
2            5          $1,400,000.00       7.100%           240.00
2            6          $500,000.00         7.000%           100.00

所以我想要完成的公式是 (WAM):
1) 乘以 CurrentUPB * RemainingMonths for LID=1
2) 对匹配 WHERE SaleEventID=1
的每一行执行此操作3) 对以上计算求和 = $411,220,000.00 = A
4) SUM 所有 CurrentUPB WHERE SaleEventID=1 等于 $2,067,000.00 =B
5) 然后除以 A/B = $198.95 这是我的 WAM

So the formula i'm trying to accomplish is (WAM):
1) Multiply CurrentUPB * RemainingMonths for LID=1
2) Do that for each row that matches WHERE SaleEventID=1
3) SUM the above calculation = $411,220,000.00 = A
4) SUM all the CurrentUPB WHERE SaleEventID=1 which equals $2,067,000.00 =B
5) Then Divide A/B = $198.95 which is my WAM

我需要考虑的是，在我的表中，我将有许多贷款，并且每个贷款都不会被赋予相同的 SaleEventID 值(不是主键)

I need to consider that in my table I will have many Loans and that each will not be attributed the same SaleEventID value (Which is not the Primary Key)

到目前为止我的查询:

SELECT l.*, A / B FROM AS WAM
FROM ( SELECT LSX_DC_Loans l
        (SELECT CurrentUPB * RemainingMonths FROM l WHERE LID = 1
         ) AS A
        (SELECT SUM (CurrentUPB) CurrentUPB FROM LSX_DC_Loans
        WHERE SaleEventID = 1
        ) AS B
FROM l
) l

我无法弄清楚如何执行第 2 步和;4. 任何帮助，示例高度赞赏.

I'm having trouble figuring out how to do steps 2 & 4. Any help, examples highly appreciated.

推荐答案

计算 WAM 和 WAIR 非常简单.想想 Excel 中的 sumproduct()

To calculate WAM and WAIR is pretty simple. Think sumproduct() in Excel

Declare @YourTable table (SaleEventID  int,LID int,CurrentUPB money,[Interest Rate] money,RemainingMonths money)
Insert Into @YourTable values
(1,1,100000.00,6.100, 11.00),
(1,2,67000.00,6.200, 360.00),
(1,3,1400000.00,6.300, 240.00),
(1,4,500000.00,7.000, 100.00),
(2,5,1400000.00,7.100, 240.00),
(2,6,500000.00,7.000,100.00)


Select SaleEventID
      ,UPB  = sum(CurrentUPB)
      ,WAM  = sum(CurrentUPB*RemainingMonths)/sum(CurrentUPB)
      ,WAIR = sum(CurrentUPB*[Interest Rate] )/sum(CurrentUPB)
 From  @YourTable
 Where SaleEventID = @Event
 Group By SaleEventID

退货

SaleEventID UPB         WAM         WAIR
1           2067000.00  198.9453    6.4564
2           1900000.00  203.1578    7.0736

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